ST890B ST890C, ST890D
1.2 A current limited high side power switch with thermal shutdown
Features
2.7 V to 5.5 V input range Programmable current limit up to 1.2 A Low quiescent current Thermal shutdown Active low FAULT indicator output 90 m (typ.) ON resistance SO-8 and DFN8L (3 x 3 mm) packages
DFN8L (3 x 3 mm) SO-8
Description Applications
PCMCIA slots Access bus slots Portable equipment
The ST890B, ST890C and ST890D are low voltage, P-channel MOSFET power switches intended for high side load switching applications. These switches operate with inputs from 2.7 V to 5.5 V, making it ideal for both 3 V and 5 V systems. The internal current limiting circuitry protects the input supply against overload. The thermal overload protection limits power dissipation and junction temperatures. The maximum current limit is 1.2 A. The current limit through the switch is programmed with a resistor from SET to ground. The devices are available in SO-8 and DFN8L (3 x 3 mm) packages.
Table 1.
Device summary
Order code ST890BDR ST890CDR ST890DTR Package SO-8 SO-8 DFN8L (3 x 3 mm) Packaging 2500 parts per reel 2500 parts per reel 3000 parts per reel
December 2007
Rev 6
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www.st.com 17
Contents
ST890B, ST890C, ST890D
Contents
1 2 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 4
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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ST890B, ST890C, ST890D
Device summary
1
Device summary
Figure 1. SO-8 pin connection (top view)
IN 1 IN 2 ON 3 GND 4
8 FAULT 7 OUT 6 OUT 5 SET
CS07570
Table 2.
Pin N. 1, 2 3 4 5
SO-8 pin description
Symbol IN ON GND SET Name and function Input P-channel MOSFET source. Bypass IN with a 1 F capacitor to ground Active low switch ON input. A logic low turns the switch ON Ground Set current limit input. A resistor from SET to GND sets the current limit for the switch. RSET = 1.38 x 103 / ILIM, where ILIM is the desired current limit in Amperes Switch output. P-channel MOSFET drain. Bypass OUT with a 0.1 F capacitor to ground Fault indicator output. This open drain output goes low when in current limit or when the die temperature exceeds 135C
6,7
OUT
8
FAULT
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Device summary Figure 2. DFN8L (3 x 3 mm) pin connection (top view)
ST890B, ST890C, ST890D
IN IN ON GND
1 2 3 4
8 7 6 5
FAULT OUT OUT SET
CS00025
Table 3.
Pin N. 1, 2 3 4 5 6,7
DFN8L (3 x 3 mm) pin description
Symbol IN ON GND SET OUT Name and function Input P-channel MOSFET source. Bypass IN with a 1 F capacitor to ground Active low switch ON input. A logic low turns the switch ON Ground Set current limit input. A resistor from SET to GND sets the current limit for the switch. Switch output. P-channel MOSFET drain. Bypass OUT with a 0.1 F capacitor to ground Fault indicator output. This open drain output goes low when in current limit or when the die temperature exceeds 135 C
8
FAULT
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ST890B, ST890C, ST890D Figure 3. Schematic diagram
Device summary
IN
OUT
/FAULT ON
+ Replica amplifier
+ ON Current limit amplifier 1.24V
SET
/ON
Control circuitry
GND
CS00026
Table 4.
Truth table for ON/OFF switch
ON/OFF L H OUT ON OFF
Table 5.
Truth table for FAULT
FAULT H L FLAG Normal operation Fault condition
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Maximum rating
ST890B, ST890C, ST890D
2
Maximum rating
Stressing the device above the rating listed in the "Absolute maximum ratings" table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. Exposure to Absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Table 6.
Symbol VI VON VFAULT_N VSET IDS Tstg Top Supply voltage Input voltage at ON pin Input voltage at FAULT_N pin Voltage at SET pin Maximum continuous switching current Storage temperature Operating junction temperature range
Absolute maximum ratings
Parameter Value -0.5 to +6 -0.5 to +6 -0.5 to +6 -0.5 to (VIN +0.5) 1.5 -65 to +150 -40 to +85 Unit V V V V A C C
Table 7.
Symbol Rthj-amb
Thermal data
Parameter Thermal resistance junction-ambient SO-8 160(1) DFN8L 37.6(2) Unit C/W
1. This value depends from thermal design of PCB on which the device is mounted. 2. This value depends from the 4-layer PCB, JEDEC standard test board.
Table 8.
Symbol
Electrical characteristics
Value Parameter Test condition(1) Min TA = 25C Typ Max 5.5 13 25 V A Unit
VI ICC
Operating voltage ID = 1 mA ON quiescent supply current VI = 5 V, ON = GND IO = 0 ON = IN VI = VOUT = 5.5 V ON = IN VI = 5.5 V VO = 0
2.7
1 A 5
I(CCOFF)
OFF quiescent supply current
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ST890B, ST890C, ST890D Table 8.
Symbol
Maximum rating
Electrical characteristics (continued)
Value Parameter Test condition(1) Min TA = 25C Typ 2.4 100 VI = 4.5 V VI = 3 V 75 90 1.178 1.24 120 130 1.302 V 1.2 A Max 2.6 V mV m m Unit
VULO VHYST RON
Under voltage lockout Under voltage lockout hysteresis ON resistance
Rising edge
2.0
VSET
Reference voltage IO = 100 mA to turn the switch VSET rise until VI - VO > OFF 0.8V Maximum programmable output over current limit Shor t circuit current limit VI = 5V, OUT connected to GND, device enabled into short circuit
IMAX
ISC
1.2 ILIM
1.5 ILIM
A
ILIM/ISET VIL VIH
ILIM to ISET current IO = 500 mA ratio VO > 1.6 V ON input low level VI = 2.7 to 5.5 V voltage ON input high level voltage ON input leakage current ISET bias current FAULT output low voltage VI = 2.7 to 3.6 V VI = 2.7 to 5.5 V VI = 5.5 V VSET = 1.24 V IO = 0A VI = VO ISINK = 1 mA
VSET = 1.4 V
970
1110
1300 0.8 V V V 1 A
2.0 2.4
II
ISET bias
0.5
3
A
VOL IOH TPROT THYST
0.15 1 130 15
V A C C
FAULT output high VFAULT = 5.5 V voltage VSET = 1 V Thermal protection Thermal hysteresis
1. VIN = 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25C
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Maximum rating Table 9. Timing characteristics
ST890B, ST890C, ST890D
Value Symbol Parameter Test condition(1) Min Slow current loop response time tRESP Fast current loop response time VI = 5 V IO = 500 mA tON Turn ON time VI = 3 V IO = 500 mA Turn OFF time VI = 5 V 1 50 2 10 s s 20% current overdrive, VCC = 5 V TA = 25C Typ 5 2 25 50 Max s s s Unit
tOFF
1. VIN = 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 C
Figure 4.
Typical application circuit
INPUT
IN
OUT
OUTPUT
100 k
IN
OUT ON/OFF
0.1F
/FAULT 1F GND
/ON
SET
R SET
CS00027
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ST890B, ST890C, ST890D
Maximum rating
2.1
Typical performance characteristics
Unless otherwise specified Tj = 25 C. Figure 5. ON resistance vs. supply voltage
Figure 6.
ON resistance vs. temperature
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Maximum rating
ST890B, ST890C, ST890D
Figure 7.
Switching waveforms
VCC=5V, R L=0.6
VCC=5V, R L=0.32
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ST890B, ST890C, ST890D
Package mechanical data
3
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 8. SO-8 package drawing
00160 23/C
1. Drawing not to scale.
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Package mechanical data Table 10.
Symbol Min A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 8(max) 0.228 0.010 0.016 Typ Max 1.75 0.25 1.65 0.51 0.25 5.00 4.00 Min 0.053 0.04 0.043 0.013 0.007 0.189 0.150
ST890B, ST890C, ST890D
SO-8 package mechanical data
millimeters inches Typ Max 0.069 0.010 0.065 0.020 0.010 0.197 0.157 0.050 0.244 0.020 0.050
0.04
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ST890B, ST890C, ST890D Figure 9. SO-8 tape and reel specifications
Package mechanical data
1. Drawing not to scale.
Table 11.
Symbol
SO-8 tape and reel mechanical data
millimeters Min Typ Max 330 12.8 20.2 60 22.4 8.1 5.5 2.1 3.9 7.9 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 Min inches Typ Max 12.992 0.519
A C D N T Ao Bo Ko Po P
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Package mechanical data Figure 10. DFN8L (3 x 3 mm) package drawing
ST890B, ST890C, ST890D
PO8092726_A
1. Drawing is not to scale. 2. Dimensions in millimeters.
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ST890B, ST890C, ST890D Table 12. DFN8L (3 x 3 mm) package mechanical data
millimeters Symbol Min A A1 b D D2 E E2 e L 0.25 0.80 0 0.25 2.95 2.30 2.95 1.70 Typ 0.85 0.02 0.030 3 2.40 3 1.80 0.65 0.30
Package mechanical data
Max 0.90 0.05 0.35 3.05 2.50 3.05 1.90
0.35
Figure 11. DFN8L (3 x 3 mm) footprint recommendations
FR8092726_A
1. Drawing not to scale. 2. Dimensions in millimeters.
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Revision history
ST890B, ST890C, ST890D
4
Revision history
Table 13.
Date 22-Jul-2005 10-Aug-2007
Document revision history
Revision 4 5 Changes Added 3 rows on Table 2 on page 3 Removed ST890CD and ST890BD from Table 1 on page 1 Updated short circuit current limit value in Table 8 on page 6 Added Section : Contents. Added ST890D and related DFN8L package information. Added Figure 2: DFN8L (3 x 3 mm) pin connection (top view) on page 4. Figure 3: Schematic diagram on page 5: redrawn, no content change. Modified title in Table 5: Truth table for FAULT on page 5. Updated Table 8: Electrical characteristics on page 6. Figure 4: Typical application circuit on page 8: redrawn, no content change
1-Dec-2007
6
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ST890B, ST890C, ST890D
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